A really good way to get on the blacklist for link sending is to send a link that is longer than the easily and quickly digestible 3 minute or shorter videos. The best way to get on the blacklist is probably sending a video that is nearly ten minutes long.
Deep linking which is linking to a specific time stamp in a youtube video will make you a better link sender and your friends will love you for it. To do this all you have to do is add: #t=00m00s to the end of the video with the number of minutes and seconds you want to link to. Learn it and guarantee your friends will appreciate it, and maybe you can even get off some blacklists.